DATA TYPE IN C++

 MINI WORLD 

DATA TYPE :

Data types define the type of data a variable can hold, for example an integer variable can hold integer data, a character type variable can hold character data etc. Data types in C++ are categorised in three groups: Built-in, user-defined and Derived.

When we write a program in any language, we need to use various variables like boolean, integer, floating, double, character and the like to store various information. Variables are nothing but reserved memory locations to store values. This means that when we create a variable we reserve some space in memory. Based on the data type of a variable, the operating system allocates memory and decides what can be stored in the reserved memory.

DATA TYPES KEYWORDS WHICH USED IN C++ 

TYPE	KEYWORD
Boolean	bool
Integer	int
Floating	float
Double	double
Character	char
String	string
Valueless / Empty	void
Long	long
Short	short
Wide Character	wchar_t
Enumeration	enum
Signed	signed
Unsigned	unsigned

Data Type Wise Memory Size And Range Of Values

TYPE	MEMORY SIZE (BYTE)	RANGE OF VALUES
bool	1 byte	True OR False
char	1 byte	-128 To 127 OR 0 To 255
unsigned char	1 byte	0 To 255
signed char	1 byte	-128 To 127
void	1 byte
short	2 bytes	-32768 To 32767
unsigned short	2 bytes	0 To 65535
short int	2 bytes	-32768 To 32767
unsigned short int	2 bytes	0 To 65535
signed short int	2 bytes	-32768 To 32767
wchar_t	2 bytes	0 To 65535
unsigned	4 bytes	0 To 4294967295
signed	4 bytes	-2147483648 To 2147483647
int	4 bytes	-2147483648 To 2147483647
unsigned int	4 bytes	0 To 4294967295
signed int	4 bytes	-2147483648 To 2147483647
long	4 bytes
long int	4 bytes	-2147483648 To 2147483647
unsigned long int	4 bytes	0 To 4294967295
signed ling int	4 bytes	-2147483648 To 2147483647
float	4 bytes	3.4E +/- 38 (7 digits)
long long	8 bytes	-9223372036854775808 To 9223372036854775807
unsigned long long	8 bytes	0 To 18446744073709551615
signed long long	8 bytes	-9223372036854775808 To 9223372036854775807
long long int	8 bytes	-9223372036854775808 To 9223372036854775807
unsigned long long int	8 bytes	0 To 18446744073709551615
signed long long int	8 bytes	-9223372036854775808 To 9223372036854775807
double	8 bytes	1.7E +/- 308 (15 digits)
long double	12 bytes	Same As Double
enum	varies none

Data Type Memory Size Code In C++ And Output

#include <iostream>

using namespace std;

int main ()

{

   cout << "THE SIZE OF bool : " << sizeof(bool) << endl;

   cout << "THE SIZE OF char : " << sizeof(char) << endl;

   cout << "THE SIZE OF unsigned char : " << sizeof(unsigned char) << endl;

   cout << "THE SIZE OF signed char : " << sizeof(signed char) << endl;

   cout << "THE SIZE OF void : " << sizeof(void) << endl;

    cout << "THE SIZE OF short : " << sizeof(short) << endl;

    cout << "THE SIZE OF unsigned short : " << sizeof(unsigned short) << endl;

    cout << "THE SIZE OF short int : " << sizeof(short int) << endl;

    cout << "THE SIZE OF unsigned short int : " << sizeof(unsigned short int) << endl;

    cout << "THE SIZE OF signed short int : " << sizeof(signed short int) << endl;

    cout << "THE SIZE OF wchar_t : " << sizeof(wchar_t) << endl;

    cout << "THE SIZE OF unsigned : " << sizeof(unsigned) << endl;

    cout << "THE SIZE OF signed : " << sizeof(signed) << endl;

    cout << "THE SIZE OF int : " << sizeof(int) << endl;

    cout << "THE SIZE OF unsigned int : " << sizeof(unsigned int) << endl;

    cout << "THE SIZE OF signed int : " << sizeof(signed int) << endl;

    cout << "THE SIZE OF long : " << sizeof(long) << endl;

    cout << "THE SIZE OF long int : " << sizeof(long int) << endl;

    cout << "THE SIZE OF unsigned long int : " << sizeof(unsigned long int) << endl;

    cout << "THE SIZE OF signed long int : " << sizeof(signed long int) << endl;

    cout << "THE SIZE OF float : " << sizeof(float) << endl;

    cout << "THE SIZE OF long long : " << sizeof(long long) << endl;

    cout << "THE SIZE OF unsigned long long : " << sizeof(unsigned long long) << endl;

    cout << "THE SIZE OF signed long long : " << sizeof(signed long long) << endl;

    cout << "THE SIZE OF long long int : " << sizeof(long long int) << endl;

    cout << "THE SIZE OF unsigned long long int : " << sizeof(unsigned long long int) << endl;

    cout << "THE SIZE OF signed long long int : " << sizeof(signed long long int) << endl;

    cout << "THE SIZE OF double : " << sizeof(double) << endl;

    cout << "THE SIZE OF long double : " << sizeof(long double) << endl;

    return 0;

}

OUTPUT :::